Zhè sān gè guójiā xíngchéng le wěngù de tiěsānjiǎo guānxi.
The three countries formed a solid iron-triangle relationship.
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usage
铁三角 (iron triangle) describes a tight, mutually reinforcing three-way relationship in politics, business, or sports. It implies strength through interlocking bonds, borrowed from the geometric rigidity of a triangle.
